Lignans and clerodane diterpenoids from .

Sixteen lignans with diverse carbon skeletons, including tetrahydrofuran lignans (1, 13-18), 7,9'-dinorlignan (2), dibenzylbutane lignans (9-10), aryl tetrahydronaphthalene lignans (11-12), dihydrobenzofuran neolignans (19-20), 8--4' neolignans (21-22), and six clerodane diterpenoid glucosides (3-8) were isolated from the 70% ethanolic extract of the stems of (Lour.) Merr. Their structures were established by spectroscopic analyses and chemical methods.

Diterpenoids from and their nitric oxide production inhibitory activity.

Six new -kaurane diterpenoids, isodonrubescins A-F (1-6), together with twenty-five known -kaurane diterpenoids (7-31), a known -atisane diterpenoid (32), and two known -abietane diterpenoids (33-34), were isolated from . Their structures were established by means of extensive MS and NMR data analysis. Among the all isolates, compound 7 was found in a natural product for the first time, and -atisane diterpenoid was discovered from in Hubei Province, P.